package com.itheima.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.common.CustomException;
import com.itheima.reggie.dto.SetmealDto;
import com.itheima.reggie.entity.Setmeal;
import com.itheima.reggie.entity.SetmealDish;
import com.itheima.reggie.mapper.SetmealMapper;
import com.itheima.reggie.service.SetmealDishService;
import com.itheima.reggie.service.SetmealService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;
import java.util.stream.Collectors;

@Service
public class SetmealServiceImpl extends ServiceImpl<SetmealMapper, Setmeal> implements SetmealService {

    @Autowired
    private SetmealDishService setmealDishService;



    //新增套餐，同时保存套餐和菜品的关联关系
    @Transactional
    @Override
    public void saveWithDish(SetmealDto setmealDto) {
        /*//保存套餐信息，操作setmeal，执行insert操作
        this.save(setmealDto);

        List<SetmealDish> setmealDishes = setmealDto.getSetmealDishes();
        setmealDishes.stream().map((item) -> {
                item.setSetmealId(setmealDto.getId());
                return item;
        }).collect(Collectors.toList());

        //保存套餐和菜品的关联关系，操作setmel_dish执行insert操作

        setmealDishService.saveBatch(setmealDishes);*/


        //保存基本信息到setmeal表
        this.save(setmealDto);
        //获得套餐id
        Long setmealId = setmealDto.getId();
        //根据套餐id，将菜品保存到菜品表
        List<SetmealDish> setmealDishes = setmealDto.getSetmealDishes();
        setmealDishes = setmealDishes.stream().map((item)->{
            item.setSetmealId(setmealId);
            return item;
        }).collect(Collectors.toList());
        setmealDishService.saveBatch(setmealDishes);

    }

    /**
     * 删除套餐，同时删除套餐和菜品的关联
     * @param ids
     */
    @Override
    @Transactional
    public void removeWithDish(List<Long> ids) {
        //查询套餐状态，确定是否可以删除
        LambdaQueryWrapper<Setmeal> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.in(Setmeal::getId,ids);
        queryWrapper.eq(Setmeal::getStatus,"1");

        //如不能删除，抛出一个异常
        int count = this.count(queryWrapper);
        if (count>0){
            throw new CustomException("套餐正在售卖中，不能删除");
        }
        //如果可以删除，则先删除套餐表中的数据setmeal
        this.removeByIds(ids);
        //删除关联表的数据setmealDish
        LambdaQueryWrapper<SetmealDish> queryWrapper1 = new LambdaQueryWrapper();
        queryWrapper1.in(SetmealDish::getSetmealId,ids);
        setmealDishService.remove(queryWrapper1);
    }

    /**
     * 根据id查询套餐以及套餐对应的菜品
     * @param id
     */
    @Override
    public SetmealDto getSetmealWithDish(Long id) {
        //查询套餐的基本信息
        Setmeal setmeal = this.getById(id);
        //创建setmealDto对象
        SetmealDto setmealDto = new SetmealDto();
        //将setmeal存入setmealDto
        BeanUtils.copyProperties(setmeal,setmealDto);
        //构建条件查询器，查询套餐对应的菜品信息
        LambdaQueryWrapper<SetmealDish> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(SetmealDish::getSetmealId,setmeal.getId());
        List<SetmealDish> setmealDishes = setmealDishService.list(queryWrapper);
        //将菜品信息写入到setmealDto
        setmealDto.setSetmealDishes(setmealDishes);
        //返回setmealDto
        return setmealDto;


    }

    /**
     * 修改套餐，并且修改菜品
     * @param setmealDto
     */
    @Override
    @Transactional
    public void updateWithDish(SetmealDto setmealDto) {
        //跟新基本信息到setmeal表
        this.updateById(setmealDto);
        //将setmealDish表清空
        //获取setmealid
        Long setmealId = setmealDto.getId();
        LambdaQueryWrapper<SetmealDish> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(SetmealDish::getSetmealId,setmealId);
        //清空
        setmealDishService.remove(queryWrapper);
        //将菜品添加到setmealDish表中
        List<SetmealDish> setmealDishes = setmealDto.getSetmealDishes();
        setmealDishes = setmealDishes.stream().map((item)->{
            item.setSetmealId(setmealId);
            return item;
        }).collect(Collectors.toList());

        setmealDishService.saveBatch(setmealDishes);
    }
}
